fix: fix various types around TreeView

[ensi321]

As title

[gemini-code-assist]

Summary of Changes

Hello @ensi321, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses several type-related inconsistencies and potential issues within the TreeView and SSZ type implementations for Bool and Uint. The changes ensure correct handling of values in data structures, proper function signatures, and efficient passing of data by reference where appropriate, contributing to the overall robustness and correctness of the SSZ library.

Highlights

• TreeView changed map update: Corrected the way void values are stored in the changed map within TreeView by using an empty struct {} and handling potential errors with try.
• Node creation with references: Modified createLeaf calls in BoolType and UintType to pass a reference (&new_leaf) to the new_leaf array, ensuring correct type matching and potentially improving efficiency by avoiding copies.
• UintType fromValuePacked return type: Updated the fromValuePacked function in UintType to correctly return the Node.Id generated by createLeaf, aligning its signature with its new behavior.

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[gemini-code-assist]

Code Review

This pull request addresses several critical type-related issues within the TreeView implementation and associated SSZ types. The changes correct compilation errors by ensuring proper values are used for void types, passing pointers where required by function signatures, and aligning function return types with the actual values being returned. These fixes are essential for the correctness and compilability of the code.

[ensi321]

Too trivial of a change. Incorporated the changes into #79 and #80